Actions save time. Time is essential in graphic design. What actions have you assigned that you've found useful?
Mine is assigning F2 in Illustrator to Select -> Inverse -> Select -> Inverse. So when I click on one single point of a path with the direct selection tool, press F2, and the double inverse causes it to select every single point of that path. It disregard the group and selects only one object of that group. Useful for duplicating paths into groups, and not having to ungroup stuff in General. Also for touching up stray paths. Click that one point of a path, press F2, and select/move/delete/isolate the selected path. Pretty nifty, what do you think?